<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Service_Amazon
 * @subpackage Ec2
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Reserved.php 16971 2009-07-22 18:05:45Z mikaelkael $
 */

require_once 'Zend/Service/Amazon/Ec2/Abstract.php';

/**
 * Allows you to interface with the reserved instances on Amazon Ec2
 *
 * @category   Zend
 * @package    Zend_Service_Amazon
 * @subpackage Ec2
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Service_Amazon_Ec2_Instance_Reserved extends Zend_Service_Amazon_Ec2_Abstract
{
	/**
	 * Describes Reserved Instances that you purchased.
	 *
	 * @param string|array $instanceId        IDs of the Reserved Instance to describe.
	 * @return array
	 */
	public function describeInstances($instanceId)
	{
		$params = array();
		$params['Action'] = 'DescribeReservedInstances';

		if(is_array($instanceId) && !empty($instanceId)) {
			foreach($instanceId as $k=>$name) {
				$params['ReservedInstancesId.' . ($k+1)] = $name;
			}
		} elseif($instanceId) {
			$params['ReservedInstancesId.1'] = $instanceId;
		}

		$response = $this->sendRequest($params);

		$xpath = $response->getXPath();
		$items = $xpath->query('//ec2:reservedInstancesSet/ec2:item');

		$return = array();
		foreach($items as $item) {
			$i = array();
			$i['reservedInstancesId'] = $xpath->evaluate('string(ec2:reservedInstancesId/text())', $item);
			$i['instanceType'] = $xpath->evaluate('string(ec2:instanceType/text())', $item);
			$i['availabilityZone'] = $xpath->evaluate('string(ec2:availabilityZone/text())', $item);
			$i['duration'] = $xpath->evaluate('string(ec2:duration/text())', $item);
			$i['fixedPrice'] = $xpath->evaluate('string(ec2:fixedPrice/text())', $item);
			$i['usagePrice'] = $xpath->evaluate('string(ec2:usagePrice/text())', $item);
			$i['productDescription'] = $xpath->evaluate('string(ec2:productDescription/text())', $item);
			$i['instanceCount'] = $xpath->evaluate('string(ec2:instanceCount/text())', $item);
			$i['state'] = $xpath->evaluate('string(ec2:state/text())', $item);

			$return[] = $i;
			unset($i);
		}

		return $return;
	}

	/**
	 * Describes Reserved Instance offerings that are available for purchase.
	 * With Amazon EC2 Reserved Instances, you purchase the right to launch Amazon
	 * EC2 instances for a period of time (without getting insufficient capacity
	 * errors) and pay a lower usage rate for the actual time used.
	 *
	 * @return array
	 */
	public function describeOfferings()
	{
		$params = array();
		$params['Action'] = 'DescribeReservedInstancesOfferings';

		$response = $this->sendRequest($params);

		$xpath = $response->getXPath();
		$items = $xpath->query('//ec2:reservedInstancesOfferingsSet/ec2:item');

		$return = array();
		foreach($items as $item) {
			$i = array();
			$i['reservedInstancesOfferingId'] = $xpath->evaluate('string(ec2:reservedInstancesOfferingId/text())', $item);
			$i['instanceType'] = $xpath->evaluate('string(ec2:instanceType/text())', $item);
			$i['availabilityZone'] = $xpath->evaluate('string(ec2:availabilityZone/text())', $item);
			$i['duration'] = $xpath->evaluate('string(ec2:duration/text())', $item);
			$i['fixedPrice'] = $xpath->evaluate('string(ec2:fixedPrice/text())', $item);
			$i['usagePrice'] = $xpath->evaluate('string(ec2:usagePrice/text())', $item);
			$i['productDescription'] = $xpath->evaluate('string(ec2:productDescription/text())', $item);

			$return[] = $i;
			unset($i);
		}

		return $return;
	}

	/**
	 * Purchases a Reserved Instance for use with your account. With Amazon EC2
	 * Reserved Instances, you purchase the right to launch Amazon EC2 instances
	 * for a period of time (without getting insufficient capacity errors) and
	 * pay a lower usage rate for the actual time used.
	 *
	 * @param string $offeringId            The offering ID of the Reserved Instance to purchase
	 * @param integer $intanceCount         The number of Reserved Instances to purchase.
	 * @return string                       The ID of the purchased Reserved Instances.
	 */
	public function purchaseOffering($offeringId, $intanceCount = 1)
	{
		$params = array();
		$params['Action'] = 'PurchaseReservedInstancesOffering';
		$params['OfferingId.1'] = $offeringId;
		$params['instanceCount.1'] = intval($intanceCount);

		$response = $this->sendRequest($params);

		$xpath = $response->getXPath();
		$reservedInstancesId = $xpath->evaluate('string(//ec2:reservedInstancesId/text())');

		return $reservedInstancesId;
	}
}
